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Nexperia USA Inc. BZX384-C39F
- Part No.:
- BZX384-C39F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-C39F.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
BZX384-C39F from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 39 V nominal breakdown voltage at 2 mA, 350 Ω maximum differential resistance, and 130 μA reverse current at 37 V, used for precision low-power voltage reference and overvoltage protection in power supply feedback paths.
For engineers reviewing the BZX384-C39F datasheet, BZX384-C39F pinout, BZX384-C39F application, or BZX384-C39F equivalent, this page delivers verified electrical parameters, thermal behavior, cathode/anode terminal mapping, real-world regulation use cases, and validated alternative parts with documented tolerance and temperature coefficient differences.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener voltage. Its 39 V nominal VZ is defined at IZ = 2 mA with ±5 % tolerance, and exhibits a positive temperature coefficient of +0.05 mV/K across operating temperature range.
The diode supports non-repetitive peak reverse power dissipation up to 40 W for 100 μs pulses and delivers ≤0.9 V forward voltage at 10 mA. Thermal resistance from junction to ambient is 415 K/W on standard FR4 PCB, limiting continuous power handling to 300 mW at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (Nominal) | 39 V at IZ = 2 mA - defines regulated voltage level in shunt configuration |
| Tolerance | ±5 % - results in actual VZ range of 37.0 V to 41.0 V under test conditions |
| rdif (Max) | 350 Ω - limits regulation error under varying load current |
| IR @ VR = 37 V | 130 μA - ensures low leakage below breakdown threshold |
| Ptot | 300 mW - maximum continuous power dissipation on standard FR4 PCB |
| Tj (Max) | 150 °C - sets upper junction temperature limit for reliability |
| Cd | 45 pF at f = 1 MHz, VR = 0 V - impacts high-frequency noise filtering capability |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm body size, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt current path |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMD package | SOD323 footprint enables high-density PCB layout with minimal board area usage |
| Stable ±5 % tolerance | Supports cost-sensitive applications where tight regulation is secondary to manufacturability |
| 300 mW total power rating | Enables direct integration into low-current feedback loops without external heat sinking |
| 40 W surge capability | Provides transient overvoltage clamping for ESD and line-surge events in industrial interfaces |
| 150 °C max junction temperature | Ensures operational integrity in enclosed or thermally constrained environments |
Applications
| Power Supply Feedback Reference | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 39 V threshold to TL431 or similar error amplifier input. Use Value: Maintains ±5 % output accuracy across temperature while consuming <100 μA quiescent current. |
Use Scenario: Protecting microcontroller I/O pins from 48 V bus transients in industrial fieldbus nodes. IC Role / Device Role / Timing Role: Fast-acting clamp diverting surge energy away from sensitive logic inputs. Use Value: Limits pin voltage to ≤41 V during 100 μs surges up to 40 W, preventing latch-up or oxide damage. |
| Low-Power Sensor Biasing | Reference Voltage Generator |
|
Use Scenario: Providing stable bias voltage to analog sensor signal conditioning circuits in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-current Zener source replacing higher-power LDOs where 39 V rail is required. Use Value: Delivers 39 V ±5 % with only 2 mA operating current, extending battery life in always-on sensing modes. |
Use Scenario: Generating fixed reference for ADC input scaling in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision shunt element establishing known voltage point for ratiometric measurement calibration. Use Value: Enables 0.5 % system-level accuracy when paired with 1 % tolerance resistors in divider networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B39 | ±2 % tolerance (38.2 V–39.8 V), 200 Ω rdif, 0.05 mV/K SZ | Narrower VZ spread improves closed-loop stability in feedback designs requiring tighter regulation | Select when system-level accuracy demands <±2.5 % output variation and thermal drift must be minimized |
| MMBZ5242BS | ±5 % tolerance (37.05 V–40.95 V), 375 Ω rdif, 100 μA IR @ 37 V | Higher leakage and slightly looser tolerance reduce regulation fidelity in low-power biasing | Choose only if second-source qualification requires Diodes Inc. footprint compatibility and 39 V nominal is acceptable |
Compared with BZX384-C39F, BZX384-B39 offers tighter tolerance and lower dynamic impedance for improved regulation accuracy, while MMBZ5242BS provides cross-manufacturer footprint alignment at the cost of higher leakage and marginally degraded thermal coefficient control.
Availability
BZX384-C39F is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage protection clamp, and low-power sensor biasing requiring stable component supply and consistent ±5 % voltage regulation performance.
Supply support for BZX384-C39F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.
The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered for cost-effective, space-constrained voltage regulation in consumer, industrial, and computing power systems.
FAQ
What is the maximum continuous reverse current for BZX384-C39F at 39 V?
The device does not specify a maximum continuous reverse current at exactly 39 V. At IZ = 2 mA, VZ is guaranteed between 37.0 V and 41.0 V. Continuous operation is limited by Ptot = 300 mW, so maximum steady-state reverse current is ~7.7 mA at 39 V - assuming full power dissipation is allocated to Zener conduction.
Can BZX384-C39F be used in place of a 3.3 V Zener diode?
No. BZX384-C39F has a nominal Zener voltage of 39 V, not 3.3 V. Substituting it for a 3.3 V part would result in catastrophic overvoltage at the regulated node. The BZX384-C3V3 (marked T6) is the correct 3.3 V variant in the same series and package.
How does the ±5 % tolerance affect circuit design margin?
A ±5 % tolerance on 39 V yields a 37.0 V to 41.0 V range. Designers must ensure downstream components tolerate this 4.0 V window - for example, feedback resistors in switching regulators must be selected to maintain output regulation across this full span, and clamping targets must remain safely below absolute maximum ratings.
Is thermal derating required above 25 °C ambient?
Yes. With Rth(j-a) = 415 K/W, junction temperature rises ~172 °C per watt. Since Ptot is rated at 300 mW only up to Tamb = 25 °C, power must be linearly reduced above that point - e.g., to ~220 mW at 50 °C ambient - to keep Tj ≤ 150 °C.
BZX384-C39F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-C39F FAQ
1.How can I place an order for BZX384-C39F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-C39F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BZX384-C39F reliable?
The price and inventory of BZX384-C39F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-C39F is usually 5 days.
3.What payment methods are accepted for BZX384-C39F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C39F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-C39F?
BZX384-C39F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-C39F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BZX384-C39F?
For technical support, including BZX384-C39F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C39F requirements.
6.How does Aetrix verify that BZX384-C39F is sourced from the original manufacturer or authorized distributors?
All BZX384-C39F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX384-C39F meets industry standards.
7.What is the process for return or replacement of BZX384-C39F?
All BZX384-C39F units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C39F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BZX384-C39F part is unused and in its original packaging.
Return procedure for BZX384-C39F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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